LXR qemu/hw/acpi/cpu_hotplug_acpi

   1/*
   2 * This program is free software; you can redistribute it and/or modify
   3 * it under the terms of the GNU General Public License as published by
   4 * the Free Software Foundation; either version 2 of the License, or
   5 * (at your option) any later version.
   6
   7 * This program is distributed in the hope that it will be useful,
   8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10 * GNU General Public License for more details.
  11
  12 * You should have received a copy of the GNU General Public License along
  13 * with this program; if not, see <http://www.gnu.org/licenses/>.
  14 */
  15
  16#include "qemu/osdep.h"
  17#include "hw/acpi/cpu_hotplug.h"
  18
  19void build_cpu_hotplug_aml(Aml *ctx)
  20{
  21    Aml *method;
  22    Aml *if_ctx;
  23    Aml *else_ctx;
  24    Aml *sb_scope = aml_scope("_SB");
  25    uint8_t madt_tmpl[8] = {0x00, 0x08, 0x00, 0x00, 0x00, 0, 0, 0};
  26    Aml *cpu_id = aml_arg(0);
  27    Aml *cpu_on = aml_local(0);
  28    Aml *madt = aml_local(1);
  29    Aml *cpus_map = aml_name(CPU_ON_BITMAP);
  30    Aml *zero = aml_int(0);
  31    Aml *one = aml_int(1);
  32
  33    /*
  34     * _MAT method - creates an madt apic buffer
  35     * cpu_id = Arg0 = Processor ID = Local APIC ID
  36     * cpu_on = Local0 = CPON flag for this cpu
  37     * madt = Local1 = Buffer (in madt apic form) to return
  38     */
  39    method = aml_method(CPU_MAT_METHOD, 1, AML_NOTSERIALIZED);
  40    aml_append(method,
  41        aml_store(aml_derefof(aml_index(cpus_map, cpu_id)), cpu_on));
  42    aml_append(method,
  43        aml_store(aml_buffer(sizeof(madt_tmpl), madt_tmpl), madt));
  44    /* Update the processor id, lapic id, and enable/disable status */
  45    aml_append(method, aml_store(cpu_id, aml_index(madt, aml_int(2))));
  46    aml_append(method, aml_store(cpu_id, aml_index(madt, aml_int(3))));
  47    aml_append(method, aml_store(cpu_on, aml_index(madt, aml_int(4))));
  48    aml_append(method, aml_return(madt));
  49    aml_append(sb_scope, method);
  50
  51    /*
  52     * _STA method - return ON status of cpu
  53     * cpu_id = Arg0 = Processor ID = Local APIC ID
  54     * cpu_on = Local0 = CPON flag for this cpu
  55     */
  56    method = aml_method(CPU_STATUS_METHOD, 1, AML_NOTSERIALIZED);
  57    aml_append(method,
  58        aml_store(aml_derefof(aml_index(cpus_map, cpu_id)), cpu_on));
  59    if_ctx = aml_if(cpu_on);
  60    {
  61        aml_append(if_ctx, aml_return(aml_int(0xF)));
  62    }
  63    aml_append(method, if_ctx);
  64    else_ctx = aml_else();
  65    {
  66        aml_append(else_ctx, aml_return(zero));
  67    }
  68    aml_append(method, else_ctx);
  69    aml_append(sb_scope, method);
  70
  71    method = aml_method(CPU_EJECT_METHOD, 2, AML_NOTSERIALIZED);
  72    aml_append(method, aml_sleep(200));
  73    aml_append(sb_scope, method);
  74
  75    method = aml_method(CPU_SCAN_METHOD, 0, AML_NOTSERIALIZED);
  76    {
  77        Aml *while_ctx, *if_ctx2, *else_ctx2;
  78        Aml *bus_check_evt = aml_int(1);
  79        Aml *remove_evt = aml_int(3);
  80        Aml *status_map = aml_local(5); /* Local5 = active cpu bitmap */
  81        Aml *byte = aml_local(2); /* Local2 = last read byte from bitmap */
  82        Aml *idx = aml_local(0); /* Processor ID / APIC ID iterator */
  83        Aml *is_cpu_on = aml_local(1); /* Local1 = CPON flag for cpu */
  84        Aml *status = aml_local(3); /* Local3 = active state for cpu */
  85
  86        aml_append(method, aml_store(aml_name(CPU_STATUS_MAP), status_map));
  87        aml_append(method, aml_store(zero, byte));
  88        aml_append(method, aml_store(zero, idx));
  89
  90        /* While (idx < SizeOf(CPON)) */
  91        while_ctx = aml_while(aml_lless(idx, aml_sizeof(cpus_map)));
  92        aml_append(while_ctx,
  93            aml_store(aml_derefof(aml_index(cpus_map, idx)), is_cpu_on));
  94
  95        if_ctx = aml_if(aml_and(idx, aml_int(0x07), NULL));
  96        {
  97            /* Shift down previously read bitmap byte */
  98            aml_append(if_ctx, aml_shiftright(byte, one, byte));
  99        }
 100        aml_append(while_ctx, if_ctx);
 101
 102        else_ctx = aml_else();
 103        {
 104            /* Read next byte from cpu bitmap */
 105            aml_append(else_ctx, aml_store(aml_derefof(aml_index(status_map,
 106                       aml_shiftright(idx, aml_int(3), NULL))), byte));
 107        }
 108        aml_append(while_ctx, else_ctx);
 109
 110        aml_append(while_ctx, aml_store(aml_and(byte, one, NULL), status));
 111        if_ctx = aml_if(aml_lnot(aml_equal(is_cpu_on, status)));
 112        {
 113            /* State change - update CPON with new state */
 114            aml_append(if_ctx, aml_store(status, aml_index(cpus_map, idx)));
 115            if_ctx2 = aml_if(aml_equal(status, one));
 116            {
 117                aml_append(if_ctx2,
 118                    aml_call2(AML_NOTIFY_METHOD, idx, bus_check_evt));
 119            }
 120            aml_append(if_ctx, if_ctx2);
 121            else_ctx2 = aml_else();
 122            {
 123                aml_append(else_ctx2,
 124                    aml_call2(AML_NOTIFY_METHOD, idx, remove_evt));
 125            }
 126        }
 127        aml_append(if_ctx, else_ctx2);
 128        aml_append(while_ctx, if_ctx);
 129
 130        aml_append(while_ctx, aml_increment(idx)); /* go to next cpu */
 131        aml_append(method, while_ctx);
 132    }
 133    aml_append(sb_scope, method);
 134
 135    aml_append(ctx, sb_scope);
 136}
 137